4) The amount of the neurosecretory protein hormone ghrelin in the blood increases as a result of visual stimulation images of food.
5) Hunger contractions start to occur in the stomach due to hunger generating signals
that reach the brain. ,
6) It is beleived that the diencephalon in fore brain and vagus nerve (10th cranial nerve) plays an important role in carrying these signals to brain.
7) Hunger pangs continue up to 30-45 minutes.
8) Increase in ghrelin levels results in sensation of hunger and motivation to consume food.